Opportunity Fire - will not work

[XLVIII Pz. Korp]

Ahhh...  Thanks for the suggested read David.  I think this section pretty much answers the question:

"One important thing to keep in mind is that units will only stick to the opportunity fire settings when they think they haven't been spotted. Opportunity fire settings won't have any effect in non-cover terrain (note that terrain that functions as cover for infantry and guns won't necessarily cover vehicles, vehicles need at least a terrain height of 2 meters which can be checked per terrain type in the parameter data dialog)."

5th Leichte Div and I both a couple of JTCS grogs from its first appearance in the 90's.  Been playing Panzer Battles for about 5 months now but I see we both still have much to "unlearn".